Serial to 3 bs2

Hi guys. I am currently working on a project that requires 3 basic stamps and want to be able to program them in their board. I was thinking of using the usb BOE to connect to the computer and have 4 wires come off that (Sin, Sout, ATN, and Gnd) and go through a 3 way switch to each stamp in the main project board, however it doesnt work. I have continuity between each of the 4 pins on the BOE board to each stamp in the main project board and no shorts between them but still nothing. The cable betweeen the BOE board and the switch is approx 800mm long and between the switch and the stamps is approx 400mm long. Is this too long? is there something else i can do?
Any help would be greatly appreciated. Thanks.


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